A website of mine is behaving weirdly. The layout sometimes is fine, and sometimes it is screwy. An example page that I see the problem on is this one: link
Disclaimer: I have yet to start my investigation into cause in earnest. I am turning to Stackoverflow because I am lazy and I hope someone will say "That happened to me once, it is probably this...". So please, no one get stuck into this working out this issue if it is something you have never seen before, as it wouldn't be fair as I have not done it myself.
Ok, some background:
The problem usually (maybe always) occurs when first viewing the page
The problem does not show up always, only sometimes
When the page shows up munged, if you refresh it usually reloads looking as it should
The site is a rails app
The css is passed through the neat Smurf Gem, which automatically minifies the CSS and Javascript on the page.
The layout problems happen in firefox (both linux and winXP)
The CSS is served up in the production environment using the ":cache => true" option which concatenates all the css files into one file
Anyway, I am hoping that this has happened to someone before and it will be really simple to fix. If not, I'll go and investigate and return with the solution (or a request for more help).
Thanks in advance!
James.
[edit]I added the first two bullet points, inspired by the comments and first answer[/edit]
We have had something similar when using HAML and SASS that resulted in the CSS being completely unavailable. It only happened on deploys. We determined it was a combination of the Rails stylesheet merging and the generation of the CSS from SASS. Sass was not done generating the CSS, which it did so on the first request to the application, when Rails attempted to merge it all together. The result, a corrupt useless CSS file. Then we stumbled upon this article which has a solution for preventing this issue.
Based on all this, my best guess is that the Smurf gem is attempting to generate your file on the first request, but Rails is serving it out before its done. The generation completes then each following request is fine. If this is the problem then the only solution i know of is to get the file generated before the first request. Of course, this does assume that it is related to deployments or application restarts in some way.
Peer
I had such a problem. The problem was only at the first time the page was loaded. Just reload it and it was fine.
The problem in my case was that the images where not there in the cache for the first time so the browser didnt know it's dimensions when preparing the page which caused the problem
If an image doesn't have a height/width assigned to it, a place is created on the page and it's put there. If the image doesn't quite fit, the browser may not know this until it's refreshed. Then it already knows the size and can properly fit it onto the page.
Related
We are currently moving an EE6 / JSF application from a deployment path someserver.com/app to its own subdomain app.someserver.com.
Most things are working smoothly, but we have had unexpected troubles with how the web layer handles the now basically nonexistent context-root.
One thing we found and fixed early was that a cookie we set had its path shortened from "/app" to "", and thus was only readable per folder on the server, not for the entire application.
We have now found a similar problem with hyperlinks that we generate in JSF:
Go to home page
This was previously rendered as href="/app" and worked fine, but now with href="" the link is understandably no longer active. I want it to say href=""/".
Is there an elegant solution for that?
Keep in mind that we also have links of the form
Go to projects page
, so simply replacing the empty context path with "/" is not good enough.
Am I missing something obvious? I saw an explanation here (which matches what we experience), but no elaboration on possible solutions.
Turns out I wasn't thinking clearly. I was so focused on fixing the string that #{request.contextPath} produces, that I missed that I basically used it wrong the entire time.
The simplest solution is to just use
...
(with a trailing slash) to get to the root of the application, and never use href="#{request.contextPath}" without a slash at all.
This solves both cases. If the application is deployed to "some_folder", the link becomes "some_folder/". And if the application is deployed to the server root, then the link becomes "/".
Hope this helps someone who stumbled into the same trap.
Let me say first that I'm quite new and inexperienced with rails. Today I tried to update an image in a rails app hosted on Heroku. Anyway, this is the simple flow I followed as I did other times before:
Add updated image to the image folder
Precompile the assets rake assets:precompile
Add and commit all changes
Push to heroku
Until this point all seems fine: I open Chrome to check my app from my domain and it's all there as expected.
The problem is that if I refresh the page all the images disappear (like they have never been loaded). This does not happen locally.
If I do a ctrl+f5 it all comes back nicely, but I lose everything again on simple refresh.. and so on.
Has anyone experienced something similar? I understand this might be hard to answer as there is not much code to show. Let me know if I can give more details.
On a final note, it seems that all works normally on a friends machine (that is, refresh doesn't give this problem). I'm thinking something might be wrong with my Chrome settings here? I don't remember having changed anything recently though.
This is very weird and quite annoying some help/insights would be great.
UPDATE: This seems indeed really to happen locally on my machine at work. I checked from another couple of computers at home and the app is displayed fine (without any refreshing problem).
Did you check if the cookie is disabled by your browser for the heroku website in particular?
I have just tested this issue with an image based website (https://unsplash.com/). When the cookie is disabled for that website, pressing F5 clears all the images, while pressing Ctrl-F5 brings those lost resources back as like as your case.
Enabling cookie resolves the issue in my case.
I just encountered a strange behaviour in my current RoR web app: every time I use the browser's back button (multiple browsers tested, safe mode included), the GET request is being sent multiple times, duplicated. Sometimes twice, but up to 5 times in a row in under 3 seconds. This also causes the SQL queries to run multiple times, doing the same thing.
If I use links to go back, or paste URLs to access the previous page, this does not happen.
Did anyone encounter this, or know what could cause it?
Thanks for your help!
Best,
Alex
Although I've found this to be caused by other issues, the main cuprit is Turbolinks.
Basically, Turbolinks loads the body of your new view via ajax, instead of pulling the whole page (it's meant to speed up the application in production).
It's often the case that Turbolinks will cause issues such as duplicate requests when pressing the back button etc... although to get it with every browser is very strange.
--
Due to a lack of code, I can only speculate on this issue.
It's probably wrong, but a good test to see if it replicates is to remove the references to turbolinks in your JS files; specifically:
#app/assets/javascripts/application.js
//= require turbolinks <- remove this line and see if it fixes the issue
I'll happily delete the answer if it's inappropriate. You'd be best putting up a public repo so that people can see what infrastructure you have.
For me, I realised that the issue was caused by javascript_include_tag out of head tag in aplication.html.erb.
After moving to correct place (inside head tag, right after stylesheet_link_tag) the multiple requests was gone!
Is it just me, or is the angular-material "Getting Started" example broken?
On that page (link above), there's an inline codepen to show using angular-material. But the demo doesn't work! (In particular, I don't see a button to collapse the sidebar.)
Since I used this example in my started project, I spent quite some time troubleshooting it -- to no avail. Then, I realized the example itself it may be broken. And sure 'nuff, it is!
Does anyone know what the actual bug is, so I can work around it on my test app? It must have worked at some time; but I can't figure out why it's broken now.
Thanks!
That particular pen is working fine for me but I have noticed a few are not working, and it's due to the angular-material.js link being incorrect in the dependencies (under the pen's settings) the link provided redirects to the CSS.
This is intentional - the sidebar only becomes collapsable on smaller screens and is open on larger screens. Shrinking your browser window will show the collapse button.
That being said, the Getting Started page is definitely in need of an update. It is a good guide for a basic page structure, but the individual demo pages will be a lot better if you're looking to try out some of the components. (Every demo has a CodePen link to open an editable version.)
I'm getting a weird error while trying to click on a Capybara Element
I'm using find(:xpath,"//a[contains(text(),'Connect')]").click
(find(:xpath,"//a[contains(text(),'Connect')]").present? return true)
the error I get is:
Selenium::WebDriver::Error::MoveTargetOutOfBoundsError Exception: Element cannot be scrolled into view:javascript:void(0);
i did some research and the only solution i found is that setting the selenium version to 2.16 may fix this issue (i'm using 2.25).
anybody got an idea?
It may happen when the page being tested is not fit into the current window size. If you know such pages where usually these error happening, you may explicitly scroll down before doing the operation on such hidden elements(like click, clear etc). Here the code to explicitly scroll down the page.
In java,
JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("javascript:window.scrollBy(250,350)");
From the times I used selenium webdriver to test .NET apps, I would get that error when the issue was exactly what it sounds like: It's looking for an object on the page that it cant scroll to for some reason. In my case it was because some dialogue boxes would appear without scrollbars and the driver had no way to "scroll the object into view"
Can you watch the execution of your test and see if that's the case? I had some luck rolling back to a previous version of firefox because 15+ was (as of about 2 months ago when I had the issue) unsupported by web driver and had this problem periodically. Rolling back selenium versions may help too.
First step though is definitely to watch the execution of the test and see whats happening though. And a good debugging idea may be to try to work through your steps manually yourself to make sure the test works by hand.
Its also worth noting that for the webdriver to be able to execute click the object actually has to be visible. IsPresent doesnt require that, it just searches the page files. Also an issue I ran into. IsPresent will still return true for objects that are not and cannot be made visible on the page (i.e. something at the bottom of the page that you cant see at the time)
Couple of tips here:
Webdriver should ideally be on the most recent update, it's what most use (Unless you're doing Ruby Automation)
Use css selectors, xpath (Whilst rendered), is almost always heavier on both resources and code.
Try defensive coding, first of all ascertain it exists. There are many ways to do that dependent on what package you are using. In ruby you would do page.has_css?('css_string')